
<div id="datos_factura" >
  <legend>Datos a Cancelar</legend>
  iva:
  <input  type="number" title="porcentaje iva" name="valor_iva" id="valor_iva" min="0" class="input-mini"  value="16">
  <input  type="number" title="descuentos" name="descuento" min="0"  onChange="descuentos(this.value);"  placeholder="descuentos" >
  <input  type="number" title="iva" name="iva" id="iva"  placeholder="Iva" readonly >
  <input  type="number" title="subtotal" name="subtotal" id="subtotal"  placeholder="Subtotal" readonly >
  <input  type="number" title="total" name="total" id="total"  placeholder="Total" readonly  required >
  <label>Observacion</label>
  <textarea name="observacion"  title="observacion factura" style="width:90%;"></textarea>
</div>
